pullnews: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/lib/news/bin/pullnews - from package: inn2

You may install the required package with command apt-get install {package}

Error in other languages:
pullnews: bevel nie gevind nie
pullnews: comandă negăsită
pullnews: comando não encontrado
pullnews: commande introuvable
pullnews: command not found
pullnews: käsku ei ole
pullnews: không tìm thấy lệnh
pullnews: komanda nerasta
pullnews: Kommando nicht gefunden.
pullnews: kommandot finns inte
pullnews: komut yok
pullnews: nie znaleziono polecenia
pullnews: níor aimsíodh an t-ordú
pullnews: no se encontró la orden
pullnews: no s'ha trobat l'ordre
pullnews: opdracht niet gevonden
pullnews: parancs nem található
pullnews: perintah tidak ditemukan
pullnews: príkaz nenájdený
pullnews: příkaz nenalezen
pullnews: команда не найдена
pullnews: командата не е открита
pullnews: 命令找不到
pullnews: コマンドが見つかりません